1. School of Medicine, Stanford University, Stanford, California, USA
2. Department of Otolaryngology–Head and Neck Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
3. Department of Otolaryngology–Head and Neck Surgery, Yale School of Medicine, New Haven, Connecticut, USA
4. Head and Neck Institute, Cleveland Clinic, Cleveland, Ohio, USA
5. Department of Otolaryngology–Head and Neck Surgery, Medical School, University of Michigan, Ann Arbor, Michigan, USA
6. Department of Otolaryngology–Head and Neck Surgery, School of Medicine, Stanford University, Stanford, California, USA